Partial isolation and translocation in vitro of messenger ribonucleic acid for phosphoenolpyruvate carboxykinase (guanosine triphosphate)

S. M. Tilghman, L. M. Fisher, L. Reshef

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

mRNA was extracted from the livers of starved rats and incubated in a heterologous cell free protein synthesizing system derived from rabbit reticulocytes. The presence of newly synthesized phosphoenolpyruvate carboxykinase (GTP) was detected by immunoprecipitation with a specific antibody to the enzyme and analysis by sodium dodecyl sulphate/polyacrylamide gel electrophoresis. The synthesis of the enzyme was dependent on the addition of rat liver RNA, whereas RNA isolated from rat spleen was inactive. If ovalbumin and anti ovalbumin were used to form the immunoprecipitates, no radioactivity that migrated as phosphoenolpyruvate carboxykinase was detected. The optimal concentrations of magnesium acetate and KCl for phosphoenolpyruvate carboxykinase synthesis were determined. When polyribosomal RNA was separated by sucrose gradient centrifugation, phosphoenolpyruvate carboxykinase mRNA migrated between 20 and 26S, in keeping with the high mol. wt. of the protein (85000). The presence of poly(A) in phosphoenolpyruvate carboxykinase mRNA was suggested by retention of mRNA activity on oligo(dT) cellulose columns. It was concluded that the cell free synthesis of phosphoenolpyruvate carboxykinase can serve as a bioassay for intracellular phosphoenolpyruvate carboxykinase mRNA.

Original languageEnglish (US)
Pages (from-to)619-626
Number of pages8
JournalBiochemical Journal
Volume156
Issue number3
DOIs
StatePublished - 1976

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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